Improvement in steam vacuum-pumps



C. H. HALL.

am Vac`uum-Pumps.

Patented Sep. 24,1872.

Improvement in ,534.

S wo mwen hmmm Urr S'rA'rRs cHARLEs H. HALL, or NRW YORK, N. v.

IMPRGVENIENT IN STEAM VACUUM-PUMPS.

Specification forming part of Letters Patent No. ESLSQ, dated September 24, 1872.

CASE T.

To atl whom it may concern:

Beit known that I, OHARLEs H. HALL, of New York city, in the State of New York, have invented a certain Improvement'in Steam Pumping Apparatus, of which the following is a specification:

-To distinguish this from other inventions of my own which are somewhat analogous, I will gesirgnate this particular invention by the leter The apparatus belongs to that class of steampumps in which the solid working parts are small, relatively, to the capacity of the apparatus, and there is a marked gain by the reduction of rubbing-surfaces and the great efliciency and small cost of the apparatus.`

The following is a description of what I consider the best means of carrying out the invention. The accompanying drawing forms a part of this specication.

Figure l is a side elevation, partly in section, and Fig. 2 is a plan view.

Similar letters of reference indicate like parts in all the Iigures.

A1 A2 are vessels of equal size, formed of cast-iron, in one piece, and adapted to resist a strong internalvpressure, as also to resist the external pressure of the atmosphere when a vacuum is formed therein. E is a steampipe which communicates with a boiler not represented. The steam-pipe E is of small internal diameter, or there must be at some point in the steam connection a narrow passage through which the steam cannot ilow readily, except in a very contracted current. O is a pipe, of sufficient size, communicating with the tank or well from which the Water is to be taken; and P is a delivery-pipe adapted to convey away the water under pressure.

The chambers A1 and A2 are filled alternately with steam and water. The action is self-controlling. When the steam is excluded .from a chamber the water is'received from the pipe O and fills it. Meantime the opposite chamber is being emptied of its water by the steam entering at its top and pressing downward on the surface with such force as to discharge the water outward through the discharge-pipe. When the Water is thus expelled the receptionlof steam is cutoff and the chamber is soon again lled with water.

' to serve as a pump-plunger.

While one chamber is being filled with water the other is expelling its water. The steam received through the steam-pipe E is excluded from one chamber by the moving of the ballvalve c to one side, and the action is alternating or intermittent by the moving of this valve c to one side or the other at intervals. When the steam is excluded from the chamber A2 the cold water rushes through the water-supply pipe O to ll the vacuum which obtains within it, andthe water is thus inducted with sufficient force to act very strongly on the large disk-valve 02, arranged as represented. It may not be necessary to explain the combination of causes which induce a movement of the ball-valve e. In brief, it is drawn away from the seat e2 over to the seat e1 at the right moment, by virtue of a partial vacuum which obtains in the other chamber A1 at the moment when it is nearly emptied of its water. By this time the chamber A2, having been entirely filled with water, either has its water induction-valve closed by gravity or is standing with the said valve a little open, ready to be closed the moment there is a back action of the water attempting to escape downward past this valve. When, by the movement of the valve e, the steam is admitted into the chamber A2 to act on the surface of the water, the water then presses backward strongly against the valve o2, and the force with which it is pressed downward is ample for overcoming a considerable resistance. I have utilized the force with which this large valve o2' rises and sinks by attaching thereto ahollow plun ger, W, provided with a valve, w, opening downward, and acting through a tight-fitting' space, The movement of the valve o2 upward lifts this plunger and allows the apparatus below, which I termthe auxiliary pump, to ll with water derived from the suction-pipe O. The movement of the valve o2 downward depresses this plunger, and, in case of a considerable resistance to the action of the auxiliary pump, a great force is available to insure its prompt movement. It is actuated by the whole pressure of the water in the vessel A2 on the large area of the valve o2. The bodyof the auxiliary pump is marked X, and the delivery-valve thereof is marked as. I can use the Water pumped by the auxiliary pump to supply the boiler of the apparatus, or for any other purpose for Which Water may be required at a higher pressure than that pumped by the main portion of the apparatus.

I have represented a similar auxiliary pump as attached on the other side of the apparatus. This duplication of the auxiliary apparatus may not be necessary in most cases.

I have not esteemed it necessary to provide a special stuffing-box to tighten the iit of the auxiliary pump-plunger W in the hole through which itl Works. A slight leak around the plunger is of triiiing importance. The sinking of the valve 02, and the consequent depression oi' the plunger W, With its connected valve, Will be sufciently prompt under most conditions to insure an adequate supply of Water from the auxiliary pump Without such C. H. HALL.

Witnesses: Y ARNOLD HRMANN, W. C. DEY. 

